Asuna is Kirito's friend and serves as a sub-leader in the Knights of the Blood (KoB), a medium-sized guild with approximately thirty members, widely regarded as the strongest in Aincrad. Despite being one of the few female players in SAO, her beauty attracts numerous invitations and proposals. Asuna possesses exceptional sword skills, earning her the nickname "Flash." Her in-game username matches her real name.
In ALO, She is known as Queen Titania, yet she is only a character who is trapped within a cage that is programmed to be an unbreakable object. She was rescued by Kirito who became a Game Master by accessing Heathcliffs account, and defeated Sugou. Kirito logged Asuna off from ALO and rejoins her in the hospital after he ended his fight with Sugou in the real world.
After the SAO incident, all the players that survived should have awoken, but Asuna is still trapped within her NerveGear. She is actually abducted by her betrothed, Sugou Naboyuki, who transfers her to Alfheim Online (ALO).
She is married to Kirito in SAO. They decide to live a peaceful life and to buy a house on the lower part of Aincrad and take a break from the guild Knights of the Blood Oath. But later they need to return to the front lines, abandoning their peaceful life.